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--[[
Copyright (C) 2017 ZTE, Inc. and others. All rights reserved. (ZTE)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
--]]
local _M = {}
_M._VERSION = '1.0.0'
local cjson_safe = require "cjson.safe"
local dao = require('dao.dao')
local tbl_util = require('lib.utils.table_util')
local stats_cache = ngx.shared.stats
local new_timer = ngx.timer.at
local tbl_isempty = tbl_util.isempty
local accept_preparing_forward_key = "accept_preparing_forward"
local forward_waiting_response_key = "forward_waiting_response"
local receive_resp_not_return_key = "receive_resp_not_return"
local req_num_stats_key = "req_num_stats"
local reset_delay = 60 -- in seconds
local remove_delay = 24*60*60 -- in seconds,24 hours
local lastday_stats = ""
function _M.accept_new_request()
local newval, err = stats_cache:incr(accept_preparing_forward_key, 1, 0)
if (not newval) then
ngx.log(ngx.ERR, "increase number of accept_not_forward_key error:", err)
end
end
function _M.forward_backend()
if not ngx.ctx.not_first_forward then
local newval, err = stats_cache:incr(accept_preparing_forward_key, -1, 1)
if (not newval) then
ngx.log(ngx.ERR, "decrease number of accept_preparing_forward error:", err)
end
end
local newval, err = stats_cache:incr(forward_waiting_response_key, 1, 0)
if (not newval) then
ngx.log(ngx.ERR, "increase number of forward_waiting_response error:", err)
end
ngx.ctx.waiting_backend_resp = true
ngx.ctx.not_first_forward = true
end
function _M.backend_failed()
ngx.ctx.waiting_backend_resp = false
local newval, err = stats_cache:incr(forward_waiting_response_key, -1, 1)
if (not newval) then
ngx.log(ngx.ERR, "decrease number of forward_waiting_response error:", err)
end
end
function _M.receive_response()
if ngx.ctx.waiting_backend_resp then
ngx.ctx.waiting_backend_resp = false
local newval, err = stats_cache:incr(forward_waiting_response_key, -1, 1)
if (not newval) then
ngx.log(ngx.ERR, "decrease number of forward_waiting_response error:", err)
end
else
local newval, err = stats_cache:incr(accept_preparing_forward_key, -1, 1)
if (not newval) then
ngx.log(ngx.ERR, "decrease number of accept_preparing_forward error:", err)
end
end
local newval, err = stats_cache:incr(receive_resp_not_return_key, 1, 0)
if (not newval) then
ngx.log(ngx.ERR, "increase number of receive_resp_not_return error:", err)
end
end
function _M.return_response()
local newval, err = stats_cache:incr(receive_resp_not_return_key, -1, 1)
if (not newval) then
ngx.log(ngx.ERR, "decrease number of receive_resp_not_return error:", err)
end
local newval, err = stats_cache:incr(req_num_stats_key, 1, 0)
if (not newval) then
ngx.log(ngx.ERR, "increase number of total_req_num error:", err)
end
end
function _M.format_req_status()
local req_status = {}
req_status[accept_preparing_forward_key] = stats_cache:get(accept_preparing_forward_key) or 0
req_status[forward_waiting_response_key] = stats_cache:get(forward_waiting_response_key) or 0
req_status[receive_resp_not_return_key] = stats_cache:get(receive_resp_not_return_key) or 0
local value, err = cjson_safe.encode(req_status)
if err then
return "Collect real-time request status failed! Error:" .. err
end
return value
end
function _M.format_conn_status()
local conn_status = {}
conn_status["connections_active"] = ngx.var.connections_active
conn_status["connections_reading"] = ngx.var.connections_reading
conn_status["connections_writing"] = ngx.var.connections_writing
conn_status["connections_waiting"] = ngx.var.connections_waiting
local value, err = cjson_safe.encode(conn_status)
if err then
return "Collect real-time connection status failed! Error:" .. err
end
return value
end
function _M.get_reqnum_stats(latest_num)
local resp = dao.get_reqnum_stats(ngx.today(), latest_num)
if tbl_isempty(resp) then
return "[]"
end
return cjson_safe.encode(resp)
end
_reset_reqnum_stats = function(premature)
if premature then return end
local count = stats_cache:get(req_num_stats_key) or 0
dao.save_reqnum_stats(ngx.today(), ngx.time().."|"..count)
stats_cache:set(req_num_stats_key, 0)
local ok, err = new_timer(reset_delay, _reset_reqnum_stats)
if not ok then
ngx.log(ngx.ERR, "failed to create _reset_reqnum_stats timer: ", err)
return
end
end
_remove_old_stats = function(premature)
if premature then return end
ngx.update_time()
if lastday_stats ~= "" and lastday_stats ~= ngx.today() then
ngx.log(ngx.ERR, "delete old data ")
dao.delete_reqnum_stats(lastday_stats)
end
local ok, err = new_timer(remove_delay, _remove_old_stats)
if not ok then
ngx.log(ngx.ERR, "failed to create _remove_old_stats timer: ", err)
return
end
lastday_stats = ngx.today()
end
function _M.init_timer()
if 0 == ngx.worker.id() then
local ok, err = new_timer(reset_delay, _reset_reqnum_stats)
if not ok then
ngx.log(ngx.ERR, "failed to create _reset_reqnum_stats timer: ", err)
return
end
ok, err = new_timer(10, _remove_old_stats)
if not ok then
ngx.log(ngx.ERR, "failed to create _remove_old_stats timer: ", err)
return
end
end
end
return _M
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